Revised SOW 520 22 167 Upgrade Mechanical Systems 8-28-22.docx

PROJECT NO. 520-22-167

UPGRADE MECHANICAL SYSTEMS, BILOXI VAMC

VA GULF COAST VETERANS HEALTH CARE SYSTEM

BILOXI, MISSISSIPPI

SCOPE OF WORK

Furnish all labor, tools, materials, equipment, and supervision necessary to perform all work associated with the installation of Project No. 520-22-167, VA Gulf Coast Veterans Health Care System (GCVHCS), Biloxi, Mississippi.

The new work required is listed as follows:

1. Building 19

a. Replace ducting from both Air Handlers to Outside Air Louvres

i. Contractor shall remove existing ductwork that connects AHU-1 and AHU-2 to the outside air louvres on each side of the building. Contractor shall install new, insulated outside air ducting from the outside air louvres on each side of the building to the air handlers.

ii. Contractor shall be responsible for installing new automated air louvres inside the air handlers and connecting them to the existing Siemens building automation system

iii. Contractor shall be responsible for relocating and reconnecting any sensors or other equipment that are displaced in the installation of the new duct.

b. Move chilled water pumps, Variable Frequency Drives (VFDs), and breaker from attic to first floor

i. Background: The water pumps for the chilled water system in building 19 are currently in the attic and at some instances are experiencing low water pressure due to the significant rise in elevation from the supply line ran to the building. This can cause cavitation in the pumps and thus the pumps along with their VFDs and power supply need to be moved to the first floor.

ii. Contractor shall remove existing pumps, VFDs, and power supplies in the attic of Building 19 and remit these to the Biloxi VAMC M&O staff.

iii. Contractor shall remove existing piping from both the primary and bypass pumps and install new 6” insulated water line in place of the pump line, to match existing.

iv. Contractor shall install (2) new Taco 6011D or approved equal pumps, suction diffusers, butterfly valves, triple duty valves, disconnects, VFDs, and power supplies in Building 19 Room 1B-127. Pumps shall have the following salient characteristics.

1. 1760 RPM

2. 300 GPM @ 100 ft

3. 15 HP

4. 10.75” Impeller Diameter

5. 460V 3PH 60Hz

v. Pumps shall be installed in parallel with the ability to “valve-out” each pump

vi. Contractor shall route existing chilled water supply line in Room 1B-127 through new pumps and back into the existing lines that continue to the attic.

vii. Contractor shall install new 200-amp panel and appropriate circuit breakers in Room 1A-121 to feed chilled water pumps.

viii. Contractor shall route power from Room 1A-121 to Room 1B-127.

2. Building 3/Boiler Plant

a. Background: In order to perform cooling tower cleaning, VA maintenance staff need a pressurized water system capable of supporting at least four wands at 2500 psi each. Piping should extend to all towers and have quick connects at each location. This project may include asbestos abatement

i. Contractor shall install four (4) electric pressure washers in boiler plant mezzanine on skid mounts.

ii. Pressure washer shall be capable of producing at least 4000 psi at 4.0 gpm

iii. Contractor shall provide individual power disconnects for each pressure washer.

iv. Contractor shall route power, in conduit, overhead on existing conduit bank to electrical panel.

v. Contractor shall route corrosion resistant piping from each pressure washer through the boiler plant through the exterior wall shared with the chiller plant roof.

vi. Contractor shall completely seal all penetrations made in walls.

vii. Contractor shall provide “quick connect” connections on the roof of the chiller plant

b. Connect Tower 1 (Model No. TTGE061975) to Towers 2 and 3 (Model Nos. NC8307K1SM06)

i. Contractor shall connect Towers 2 and 3 into the existing condenser water supply and return currently connected to Tower 1 on top of building 3.

ii. Contractor shall install valves on Tower 1, 2, and 3 connections where they connect with the existing condenser water supply and return lines.

iii. Contractor shall provide COR with shop drawings to verify piping path connections

iv. Condenser lines shall match sizing of existing condenser lines

c. Install discharge duct from exhaust fan 3 to 8’ above roof

i. Background: Exhaust fan 3 serves the 3rd floor laboratories. The exhaust air and OA intake are located around the corner from each other resulting in exhaust air being reintroduced to the building through the OA intake. This would duct the exhaust air away from the OA intake and above the roof line.

ii. Contractor shall install ducting from existing 3rd floor louvres to above roofline.

iii. Ductwork shall match ductwork from 4th floor in color and design

iv. Ductwork shall be approximately 55” W x 48” D x 360” H

v. Louvre tie in shall be approximately 118” W x 12” D x 48” H

vi. Contractor shall verify all dimensions on-site

vii. Contractor shall provide COR with shop drawings to verify duct work size and path

d. Replace Tower Fill

i. Contractor shall completely remove the existing fill media on each of the 3 towers atop the chiller plant.

ii. Contractor shall furnish and install new Marley OEM fill media to include fill sheets with integral louvers and drift eliminators, stainless steel fill support tubes, and all necessary installation hardware

iii. Contractor shall clean and remove all debris waste from GCVHCS

iv. Contractor shall replace fill 1 tower at a time. Each cooling tower shall be fully operational before work begins on the remaining towers

v. Contractor shall be responsible for all electrical work that may be encountered in replacement of tower fill media. wiring/unwiring of fan motors, heaters, heat trace tape, removing/installing of all types of electrical piping/conduit, and other sources of electrical energy, etc.

3. Building 25/19/T-44

a. Replace Emergency Generator Fuel Line and install return feed

i. Background: The fuel line located between the above ground diesel tank at Building 25 and the emergency generator at Building 19, is a double walled line that is showing signs of leaking in the inspection manhole. The manhole accumulates enough diesel fuel that it must be emptied every 2-3 months. In addition to this the return line needs to be installed from the day tank in the attic of Building 25 to the above ground diesel tank.

ii. Contractor shall remove and replace existing fuel line inside of the inspection manhole on the south side of Building 19.

iii. Contractor shall remove any fuel in the manhole prior to and after replacement of fuel line.

iv. Contractor shall install a new return line between the day tank in the Attic of Building 25 to the above ground diesel tank on the exterior of Building 25.

v. Contractor shall provide COR with shop drawings of proposed piping path.

4. Building 26

a. Re-pipe and replace the chilled water pumps from the return side to the supply side

i. Background: The previous cooling system in Building 26 required the chilled water pumps to be on the return side rather than the supply side. Currently the building is relying on the pumps from the chiller plant to pump chilled water to and through Building 26. Relocating these pumps from the return to the supply side will provide the building with a more adequate and efficient supply of chilled water throughout the building.

ii. Contractor shall remove existing pumps, VFDs, and power supplies in the mechanical room of Building 26 and remit these to the Biloxi VAMC M&O staff.

iii. Contractor shall demo existing chiller piping layout in mechanical room and install new piping configuration so that pumps will be tied into the chiller supply line.

iv. Contractor shall install (2) new Taco 6011D or approved equal pumps, disconnects, VFDs, and power supplies in mechanical room.

v. Pump characteristics shall be as follows:

1. 1760 RPM

2. 300 GPM @ 100 ft

3. 15 HP

4. 10.75” Impeller Diameter

5. 460V 3PH 60Hz

vi. Pumps shall be installed in parallel with the ability to “valve-out” each pump

vii. Contractor shall provide COR with shop drawings of proposed piping layout

WORK SCHEDULE

1. All work shall be completed within 240 calendar days after “Notice to Proceed” is received by the Contractor.

MISCELLANEOUS:

1. Contractor shall be responsible (if applicable) for moving any equipment, furniture and/or supplies as necessary to accomplish the renovation tasks. It shall also be the contractor’s responsibility to put all removed furniture, equipment, and supplies back in their approximate respective locations.

1. All new work shall meet VA handicap accessibility requirements.

1. Contractor to verify all room dimensions and utility locations.

1. Contractor to provide a detailed As-Built of the completed project.

1. Contractor is responsible for providing a HEPA filtration unit and to maintain negative air pressure in construction areas at all times.

1. If applicable the contractor to install and maintain a temporary 1hr fire rated construction partition, door and frame to provide smoke-tight separations between construction areas and corridor before any work begins. Fire tape will need to be used to seal any cracks and joints in construction wall.

1. Prime contractor is responsible for informing all sub-contractors and employees of nature of work, hospital safety polices and requirements.

1. All contractors are to obtain a contractors ID badge and have them visibly displayed at all times.

1. Construction areas are to be clean and free of debris (including scrap material and food) at all times.

1. A tested/inspected fire extinguisher is to be on site and easily assessable throughout the duration of the construction project.

1. Supply, return air and exhaust vents are to be sealed/covered to prevent dust migration.

1. Fire alarms and detection systems are to remain operational and unimpaired unless located directly in construction area. Alarms and detection systems located in construction areas are to be temporarily covered during working hours and uncovered at the end of the day, to prevent setting off a false alarm. The prime contractor is responsible for all charges billed to the VA from the local fire department due to falsely setting off the fire alarm system.

1. Lockout/tagout procedures are to be used at all times, as appropriate.

1. Construction carts transporting debris are to be covered to minimize airborne particulate matter from debris.

1. Walk-off mat adhesive strips are to be placed at construction entry/exit and are to be changed sufficiently enough to maintain clean entry/exits.

1. Ceiling tiles are to be replaced when above space is not being accessed.

1. Contractor to obtain an “Above the Ceiling Permit” prior to doing any work.

SAFETY CONSIDERATIONS:

Contractor’s workmen shall provide and utilize all safety requirements in accordance with OSHA regulations during all phases of the work. Contractor shall provide and utilize scaffolding and ladders in accordance with all OSHA regulations.

FIRE PROTECTION DURING CONSTRUCTION:

1. Coordinate with the facility prior to and concurrent with design.

1. Fire protection during construction shall comply with VA Master Construction Specification (VAMCS) 01 00 00, General Requirements. (Note: VAMCS 01 00 00, General Requirements, addresses NFPA 241, Joint Commission Interim Life Safety Measures, Hot Work Permits. This specification section was formerly section 01010.)

1. Separate all occupied areas from demolition, renovation, or construction activities by temporary smoke-tight construction partitions of gypsum board or other approved non-combustible or limited-combustible material. Partitions shall be full height, extending through suspended ceilings to the floor slab or roof deck above and shall be one-hour fire rated, unless sprinklers are installed and are operational on both sides of the temporary partition whereupon the partition may be permitted to terminate at the ceiling in accordance with NFPA 241. Where the ceiling on one side of the temporary construction barrier has been removed, the temporary wall would need to go to the deck above.

1. Note: This requirement is due to the inherently greater potential for fire or hazardous materials incidents associated with the combustibles and operations of demolition/construction. This risk is made worse by the likelihood of compromised fire protection systems and fire/smoke resistant construction. This does not obviate the need to provide other protective measures to contain dust and debris as specified by VAMCS 01 00 00 section 1.8(D)(2). Sprinklers are considered to be operational when they are installed in accordance with NFPA 13 (spacing, protection, distance from the ceiling, etc.) and there is a sufficient automatic water supply. If the ceiling was removed and the sprinklers remain at the original ceiling level, they would likely not be considered operational.

1. Provide dust proof one-hour / fire-rated drywall construction barriers to completely separate construction from the operational areas of the hospital in order to contain dirt debris and dust. Barriers shall be sealed and made presentable on hospital occupied side. Install a self-closing rated door in a metal frame, commensurate with the partition, to allow worker access. Maintain negative air at all times. A fire retardant polystyrene, 6-mil thick or greater plastic barrier meeting local fire codes may be used where dust control is the only hazard, and an agreement is reached with the COTR and Safety Office.

1. Phase construction as necessary to ensure that obstruction of exits is minimized or avoided. If exits are obstructed during construction, provide alternate exit routes during each phase of construction and identify the alternate routes on the construction drawings.

1. Minimize or avoid disruptions to fire alarm and sprinkler systems. Delineate phasing of construction to ensure that installations of new systems are expedited, and where possible, maintain existing systems in service until the replacement system is operational. If fire protection systems are to be disrupted, ensure procedures are incorporated to maintain equivalent levels of fire protection and provide formal notification to the facility while systems are down.

INFECTION CONTROL - DURING CONSTRUCTION:

1. Implement the requirements of VAMC’s Infection Control Risk Assessment (ICRA) team. ICRA Group may monitor dust in the vicinity of the construction work and require the Contractor to take corrective action immediately if the safe levels are exceeded.

1. The contractor is responsible for notifying/educating all personnel involved in the construction or renovation process in infection prevention measures established by the medical center and as noted on the ICRA.

1. Isolate HVAC system in area where work is to be done to prevent contamination of duct system.

1. Complete all critical barriers i.e. (sheetrock, plastic, etc. to seal area from non-work area or implement control cube method (cart with plastic covering and sealed connection to work site with HEPA vacuum - prior to vacuuming and prior to exit) before construction begins.

1. HEPA filtration is required where the exhaust dust may reenter the breathing zone.

1. Contractor shall verify that construction exhaust to exterior is not reintroduced to the medical center through intake vents, or building openings.

1. Negative air pressure must be maintained within work space throughout the construction project. Install HEPA (High Efficiency Particulate Accumulator) filter vacuum system rated at 95% capture of 0.3 microns including pollen, mold spores and dust particles. Insure continuous negative air pressures occurring within the work area. HEPA filters should have ASHRAE 85 or other pre-filter to extend the useful life of the HEPA. Provide both primary and secondary filtrations units. Exhaust hoses shall be heavy duty, flexible steel reinforced and exhausted so that dust is not reintroduced to the medical center. HEPA filters must be routinely monitored and replaced once filter become visibly dirty or is no longer effective.

1. Seal all holes, pipes, conduits, penetrations or punctures within envelope of work area in appropriate manner. Method of sealing must maintain the construction areas required fire/smoke rating.

1. During demolition or any dust producing work or work in the ceiling, disposable shoes or shoe covers must be worn and removed in the “ante-room” when the worker exits the work site.

1. Do not remove construction barriers from work area until completed project is signed off by COTR and area is thoroughly cleaned.

1. Provide and install adhesive dust “sticky” walk-off mats, minimum 600mm x 900mm (24” x 36”), at each entrance/exit of construction area. Replace walk-off mats as often as required to maintain clean work areas directly outside construction areas at all times.

1. Vacuum and wet mop all transition areas from construction to the occupied medical center at the end of each workday. Vacuum shall utilize HEPA filtration. Maintain surrounding area frequently. Remove debris as they are created. Transport these outside the construction area in containers with tightly fitting lids.

1. There shall be no standing water during construction. This includes water in equipment drip pans and open containers within the construction areas. All accidental spills must be cleaned up and dried within 12 hours. Remove and dispose of porous materials that remain damp for more than 72 hours.

INFECTION CONTROL – UPON PROJECT COMPLETION:

1. Remove barrier material carefully to minimize the spreading of dirt and debris associated with construction.

1. Contain construction waste before transport in tightly covered containers.

1. Cover transport receptacles or carts. Tape covering unless solid lid.

1. Wet mop area with disinfectant or as approved by COTR.

1. Remove isolation of HVAC systems in areas where work is being performed.

1. HEPA vacuum and wipe clean all surfaces in the construction area. This includes walls, ceilings, cabinets, casework, furniture (built-in or free standing), partitions, flooring, etc.

NOTE:

Contractor shall submit samples of all new proposed materials for approval with manufacturer’s literature. No materials shall be procured or installed prior to approval.

All work to be performed during normal business hours 8:00 AM and 4:30 PM, Monday through Friday, exclusive of Federal holidays. However, some areas may require work to be performed outside of normal working hours.

Site shall be kept clean and free from debris at all times and contractor shall remove debris daily from the health care system property. Contractor will not be allowed to use Government tools, materials, and/or labor for this project.

All work is to be performed in strict compliance with the “Scope of Work”.